$${ 9 }^{ 2 } | { 3 }^{ 2 } { 4 }^{ 2 } { 9 }^{ 2 }$$
$944784$
$$81|3^{2}\times 4^{2}\times 9^{2}|$$
$$81|9\times 4^{2}\times 9^{2}|$$
$$81|9\times 16\times 9^{2}|$$
$$81|144\times 9^{2}|$$
$$81|144\times 81|$$
$$81|11664|$$
$$81\times 11664$$
$$944784$$
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$2^{4}\times 3^{10}$